Variable angle impeller electronic water pump

Abstract

The present application relates to a variable angle impeller electronic water pump, comprising a pump shell assembly and a variable angle impeller assembly, the pump shell assembly comprising a pump shell base and a pump cover, a cylindrical auxiliary flow cavity being arranged at the front end of the base, an annular main flow cavity being arranged in the pump cover, the two constituting a liquid flow cavity, the side wall of the main flow cavity having a liquid outlet pipe and an axial middle part having a liquid inlet pipe, a centrifugal impeller being rotatably connected in the base and being driven by an electromagnetic assembly, in the variable angle impeller assembly, the driving part comprising a driving ring corresponding to the end face of the auxiliary flow cavity of the pump shell assembly, a plurality of driving mechanisms being annularly arranged on the driving ring, each mechanism comprising a plurality of driving windings, a driven ring being further arranged and being floatingly connected to the inner wall of the auxiliary flow cavity, a plurality of driving permanent magnets being annularly arranged on the driven ring and corresponding to the driving windings; the blade part being composed of a plurality of annularly arranged elastic material guide vanes fixed between the auxiliary flow cavity and the driven ring, the water pump being driven to rotate by the interaction between the driving windings and the driving permanent magnets, so that the elastic guide vanes are deformed to change the angle and realize liquid flow regulation.

Description

Technical Field

[0001] This invention relates to an electronic water pump with a variable angle impeller, belonging to the field of automotive parts and equipment. Background Technology

[0002] As a key component of automotive cooling systems, electric water pumps are used in both traditional and new energy vehicles. Current electric water pumps mainly control the flow rate of coolant inside the vehicle by adjusting the impeller speed, which is used to control the cooling intensity under cold, hot, and different load conditions. However, when the electric water pump speed is too low, it will also affect the output kinetic energy of the electric water pump, which in turn affects the pressure in the pipes. If the pressure in the pipes is too low, the coolant in some areas may not be able to flow in real time due to the flow resistance inside the pipes, which may lead to local overheating. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the technical problem of low cooling pipe pressure caused by low speed of electric water pump in the prior art, and to provide an electric water pump with a variable angle impeller.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] An electronic water pump with a variable-angle impeller, comprising:

[0006] The pump housing assembly includes a pump housing base and a pump cover. A cylindrical secondary flow chamber is provided at the front end of the pump housing base, and an annular main flow chamber is provided inside the pump cover. The main flow chamber and the secondary flow chamber constitute a liquid flow chamber. An outlet pipe is provided on the side wall of the main flow chamber, and an inlet pipe is provided in the axial middle of the main flow chamber. A centrifugal impeller is rotatably connected inside the pump housing base. The centrifugal impeller is through-hole disposed in the secondary flow chamber and is driven by an electromagnetic assembly sealed and installed inside the pump housing base.

[0007] It also includes the variable angle impeller assembly;

[0008] The variable angle impeller assembly includes:

[0009] The drive unit includes a drive ring disposed on the end face of the pump housing assembly corresponding to the secondary flow cavity, and a plurality of drive mechanisms are arranged in a ring array on the drive ring, each drive mechanism including a plurality of drive windings; it also includes a driven ring floatingly connected to the inner wall of the secondary flow cavity, and a plurality of drive permanent magnets corresponding to the drive windings are arranged in a ring array on the driven ring.

[0010] The blade section includes several annular arrays of guide blades fixed between the secondary flow cavity and the driven ring. The guide blades are made of an elastic material.

[0011] As a further improvement of the present invention, a plurality of floating seats are arranged in an annular array in the inner ring of the driven ring, and a floating groove is provided in the floating seat with the longitudinal axis perpendicular to the plane of the driven ring, and the end of the guide blade is slidably connected in the floating groove.

[0012] The floating groove structure can compensate for the change in radial distance caused by the deflection of the guide blades, and prevent plastic deformation of the guide blades or damage to the connecting mechanism caused by excessive stretching or compression of the guide blades.

[0013] As a further improvement of the present invention, the centrifugal impeller includes a rotating support part connected to the electromagnetic assembly, a blade mechanism is provided above the rotating support part, and an annular first structural groove is provided between the bottom of the rotating support part and the end face of the secondary flow cavity, and the aforementioned floating seat is arranged in the first structural groove.

[0014] The first structural groove ensures that the floating seat structure does not interfere with the liquid discharged from the impeller, thereby improving the liquid flow efficiency and reducing the overall flow resistance of the structure.

[0015] As a further improvement of the present invention, a push seat is fixedly connected to the inner ring of the auxiliary flow cavity corresponding to the outer ring of the rotating support. An inner sliding gap is provided between the inner ring of the push seat and the rotating support, and an outer sliding gap is provided between the outer ring of the push seat and the driven ring. A push ring is also provided at the top of the outer ring of the push seat. A limiting ring is fixed above the driven ring by an array of floating seats. A wave spring is provided between the limiting ring and the push ring, and the wave spring slides in contact with the limiting ring and the push ring. The height of the floating groove is greater than the height of the end of the guide blade.

[0016] The push seat can limit the axial floating position of the driven ring, and at the same time, it can squeeze the driven ring through the wave spring to ensure the air between the electromagnetic drive structure and the driving permanent magnet, thus ensuring the transmission effect. It can also press the driven ring to the bottom surface of the secondary flow cavity in a static state to ensure the locking of the driven ring.

[0017] As a further improvement of the present invention, a rotating groove is provided at the bottom of the secondary flow cavity, the driven ring is slidably connected in the rotating groove, and the driving ring is embedded in the bottom of the rotating groove;

[0018] The rotating groove structure reduces the volume occupied by the driven ring and driving ring structures in the liquid flow chamber, and also reduces the flow resistance generated by the structure.

[0019] As a further improvement of the present invention, a second structural groove is provided in the inner ring of the driven ring, a first positioning ring is provided at the bottom of the second structural groove, a support protrusion extending toward the second structural groove is provided in the inner ring of the secondary flow cavity, and a second positioning ring is provided on the support protrusion to fit into the first positioning ring; both the first positioning ring and the second positioning ring are provided with a plurality of inlaid protrusions arranged in a circular array, and the cross-section of the inlaid protrusions is triangular or arc-shaped.

[0020] The embedded protrusions on the first and second positioning rings can further ensure the stability of the driven ring positioning through the wave spring when the magnetic drive mechanism is disconnected, reducing the loosening of the driven ring caused by fluid flow impact.

[0021] As a further improvement of the present invention, a plurality of insert seats are arranged in an annular array on the outer ring of the secondary flow cavity, and a liquid inlet gap is provided between the array axis of the insert seats and the outer ring boundary of the secondary flow cavity; an insert groove is provided on the side of the insert seat facing the center of the secondary flow cavity, and the outer ring of the guide blade is fixedly connected to the insert groove.

[0022] The inlay seat is located outside the secondary flow cavity instead of being embedded, which ensures the connection area at the root of the guide vane and the strength of the guide vane.

[0023] As a further improvement of the present invention, a bending portion is provided at both ends of the guide blade, wherein the bending portion includes a stress-relieving portion with an arc shape having an arc angle greater than 180°.

[0024] The bend prevents the guide vanes from converging at the two connection ends, thus reducing the possibility of guide vane breakage.

[0025] The beneficial effects of this invention are:

[0026] This invention incorporates several flexible guide vanes within an existing electronic water pump. By deflecting these vanes, the cross-sectional area of ​​the electronic water pump is altered, thereby changing the ratio of the front and rear cross-sectional areas of the gradually expanding structure formed by two adjacent sets of guide vanes. At lower pump speeds, while reducing the pump flow rate, the ratio of the front and rear cross-sectional areas can be increased by reducing the cross-sectional area, ensuring a higher conversion rate of pump flow rate to water pressure, maintaining constant water pressure output, and preventing localized overheating within the pipeline. Simultaneously, the cross-sectional area can be flexibly controlled in conjunction with the pump speed to improve the adjustment accuracy of pressure output and flow rate control. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 yes Figure 1 A partial schematic diagram of point A in the middle;

[0030] Figure 3 This is a schematic diagram of the drive ring structure;

[0031] Figure 4 This is a top view of the driven ring;

[0032] Figure 5 This is a bottom view of the driven ring;

[0033] Figure 6 This is a schematic diagram of the arrangement of the guide vanes;

[0034] In the diagram: 1. Pump housing base; 2. Motor winding; 3. Motor permanent magnet; 4. Permanent magnet bracket; 5. Motor shaft; 6. Pump cover; 7. Discharge pipe; 8. Inlet pipe; 9. Expansion groove; 10. Centrifugal impeller; 11. Impeller blade; 12. Secondary flow chamber; 13. Main flow chamber; 14. Embedded seat; 15. Guide vane; 16. Extension protrusion; 17. Drive ring; 18. Drive winding; 19. Driven ring; 20. Drive permanent magnet; 21. Support protrusion; 22. First positioning ring; 23. Floating seat; 24. Push seat; 25. Push ring; 26. Limiting ring; 27. Wave spring; 28. First structural groove; 29. ​​Second structural groove; 30. Sliding bearing. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0036] like Figure 1 An electronic water pump with a variable-angle impeller, comprising:

[0037] like Figure 1Pump casing assembly: The pump casing assembly includes a pump casing base 1 and a pump cover 6; a cylindrical secondary flow chamber 12 is provided at the front end of the pump casing base 1, and an annular main flow chamber 13 is provided inside the pump cover 6. The main flow chamber 13 and the secondary flow chamber 12 constitute a liquid flow chamber. An outlet pipe 7 is provided on the side wall of the main flow chamber 13, and an inlet pipe 8 is provided in the axial center of the main flow chamber 13. A centrifugal impeller 10 is rotatably connected inside the pump casing base 1. The centrifugal impeller 10 is through-hole disposed in the secondary flow chamber 12. The electromagnetic assembly, which is installed in the pump casing base 1 through a seal, is driven to rotate. The electromagnetic assembly mainly includes a motor winding 2 set in the pump casing, a motor shaft 5 rotatably connected in the pump casing, a permanent magnet bracket 4 fixed on the motor shaft 5, a motor permanent magnet 3 placed on the permanent magnet bracket 4, a centrifugal impeller 10 fixedly connected to the front end of the motor shaft 5, and a sealed bearing set between the front end of the pump casing and the motor shaft 5. The centrifugal impeller 10 includes an impeller seat fixed to the motor shaft 5 and impeller blades 11 fixed on the impeller seat.

[0038] like Figure 3 and Figure 5 The variable angle impeller assembly mainly includes: a drive section, which includes a drive ring 17 disposed on the bottom surface of the auxiliary flow cavity 12 of the pump housing assembly, and a plurality of drive mechanisms arranged in an annular array on the drive ring 17, each drive mechanism including a plurality of drive windings 18; the drive section also includes a driven ring 19 floatingly connected to the inner wall of the auxiliary flow cavity 12, on which a drive permanent magnet 20 corresponding to the drive windings 18 is arranged in an annular array; and a blade section, which includes a plurality of guide blades 15 arranged in an annular array fixed between the auxiliary flow cavity 12 and the driven ring 19, the guide blades 15 being made of stainless steel.

[0039] like Figure 4 The driven ring 19 has an inner ring array of several floating seats 23. Each floating seat 23 has a floating groove with its longitudinal axis perpendicular to the plane of the driven ring 19. The end of the guide blade 15 is slidably connected to the floating groove. The circumferential sliding of the guide blade 15 relative to the floating groove compensates for the change in the radial distance of the blade deflection, preventing plastic deformation and damage to the connecting mechanism.

[0040] like Figure 1 and Figure 2 In this design, an annular first structural groove 28 is provided between the bottom of the rotating support part of the centrifugal impeller 10 and the end face of the secondary flow chamber 12, and the floating seat 23 is arranged in the groove to avoid interfering with the liquid flow, improve efficiency and reduce flow resistance.

[0041] like Figure 1 and Figure 2In this design, a pusher seat 24 is provided on the inner ring of the auxiliary flow cavity 12, corresponding to the outer ring of the rotating support. The inner ring of the pusher seat 24 has inner and outer sliding gaps with the rotating support, and the outer ring has inner and outer sliding gaps with the driven ring 19. A pusher ring 25 is provided at the top of the outer ring of the pusher seat 24. A limiting ring 26 is fixed above the driven ring 19 via a floating seat 23. A wave spring 27 is provided between the two, and the wave spring 27 slides in contact with the limiting ring 26 and the pusher ring 25. The pusher seat 24 limits the axial floating of the driven ring 19, and the wave spring 27 compresses to ensure the electromagnetic drive air gap and electromagnetic force transmission effect between the driven ring 19 and the drive ring 17. Simultaneously, when the drive ring does not generate magnetic force, locking is achieved by pressing the driven ring 19. Furthermore, the height of the floating groove is greater than the height of the guide blade tip, so that when the driven ring 19 floats relative to the pusher ring 25 against the elasticity of the wave spring 27, the guide blade 15 does not experience longitudinal twisting, reducing the possibility of cracking of the guide blade 15.

[0042] like Figure 2 The auxiliary flow chamber 12 has a rotating groove at the bottom. The driven ring 19 is slidably connected to the inner wall of the rotating groove through the inner wall sliding bearing 30. The driving ring 17 is embedded in the bottom of the rotating groove, thereby reducing the flow resistance of the driven ring 19 and the driving ring 17 on the liquid flow chamber composed of the main flow chamber 13 and the auxiliary flow chamber 12.

[0043] like Figure 2 The driven ring 19 has a second structural groove 29 in its inner ring and a first positioning ring 22 at the bottom of the second structural groove 29. The inner ring support protrusion 21 of the secondary flow cavity 12 has a second positioning ring that fits into the first positioning ring 22. Both of them are arranged in a ring array with several triangular cross-sections of inlaid protrusions. When the magnetic force of the drive ring 17 is disconnected, the first positioning ring 22 and the second positioning ring can be fitted together by the spring force of the wave spring 27, thereby improving the locking stability of the driven ring and reducing the risk of loosening due to liquid flow impact.

[0044] like Figure 2 The auxiliary flow cavity 12 has a ring array of several inlay seats 14 on its outer ring. The array axis of the inlay seats 14 and the outer ring boundary are provided with a liquid inlet gap. The inlay seats 14 are provided with an inlay groove on the side facing the center. The outer ring of the guide blade 15 is fixed therein. By increasing the connection area with the guide blade 15, the structural strength of the guide blade 15 at the stress concentration position is ensured, and the guide blade 15 is prevented from breaking.

[0045] like Figure 6 The guide blade 15 has bent sections at both ends, including opposite arc-shaped stress relief sections with an arc angle greater than 180°; the pump cover 6 has an expansion groove 9 with an arc-shaped bottom cross section at the top of the main flow chamber 13, and an arc-shaped extension protrusion 16 at the top of the blade extends into the groove. The arc-shaped excessive stress is dispersed to prevent the guide blade 15 from breaking during bending, while ensuring the straightness of the middle part of the guide blade 15 and ensuring smooth flow during centrifugal discharge.

[0046] The working process is as follows: the electromagnetic assembly drives the motor shaft 5 to rotate, which in turn drives the centrifugal impeller 10 to rotate. The coolant enters the middle of the centrifugal impeller 13 from the inlet pipe 8. After being accelerated and centrifuged by the centrifugal impeller 12, it is discharged from the outlet pipe 7 through the secondary flow chamber 12 and the main flow chamber 13.

[0047] When system demand changes, an external control signal triggers the drive winding 18 of the drive ring 17 to be energized, generating a magnetic field that interacts with the drive permanent magnet 20 of the driven ring 19, causing the driven ring 19 to rotate at a certain angle relative to the drive ring 17. The rotation of the driven ring 19 causes the root of the guide vane 15 to deflect and oscillate. After oscillation, the distance between the middle of adjacent guide vanes 15 and the root of adjacent guide vanes 15 changes, thereby altering the cross-sectional area of ​​the end portion of the drainage chamber divided by several guide vanes 15. This adjustment regulates the drainage pressure by changing the ratio of the front and rear cross-sectional areas of the drainage chamber formed by the gradually expanding structure of adjacent vanes.

[0048] At low speeds, the cross-sectional area at the end is reduced to increase the conversion rate of flow velocity to water pressure, ensuring constant water pressure and preventing local overheating of the pipeline. Under different operating conditions, the cross-sectional area is flexibly controlled in conjunction with the speed to precisely adjust the pressure output and flow velocity, adapting to complex load requirements.

[0049] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An electronic water pump with a variable-angle impeller, comprising: Pump housing assembly, which includes pump housing base (1) and pump cover (6). A cylindrical secondary flow chamber (12) is provided at the front end of the pump casing base (1), and an annular main flow chamber (13) is provided inside the pump cover (6). The main flow chamber (13) and the secondary flow chamber (12) constitute a liquid flow chamber. An outlet pipe (7) is provided on the side wall of the main flow chamber (13), and an inlet pipe (8) is provided in the axial middle of the main flow chamber (13). A centrifugal impeller (10) is rotatably connected inside the pump casing base (1). The centrifugal impeller (10) is provided through the secondary flow chamber (12). The centrifugal impeller (10) is driven by an electromagnetic assembly sealed and installed inside the pump casing base (1). Its characteristic is that it also includes a variable angle impeller assembly; The variable angle impeller assembly includes: The drive unit includes a drive ring (17) disposed on the end face of the pump housing assembly corresponding to the secondary flow cavity (12), and a plurality of drive mechanisms are arranged in an annular array on the drive ring (17), each drive mechanism including a plurality of drive windings (18); it also includes a driven ring (19) floatingly connected to the inner wall of the secondary flow cavity (12), and a plurality of drive permanent magnets (20) corresponding to the drive windings (18) are arranged in an annular array on the driven ring (19). The blade section includes several annular arrays of guide blades (15) fixed between the secondary flow cavity (12) and the driven ring (19). The guide blades (15) are made of elastic material. Several floating seats (23) are arranged in annular array in the inner ring of the driven ring (19). Floating grooves with longitudinal axes perpendicular to the plane of the driven ring (19) are arranged in the floating seats (23). The ends of the guide blades (15) are slidably connected to the floating grooves.

2. The electronic water pump with a variable angle impeller as described in claim 1, characterized in that: The centrifugal impeller (10) includes a rotating support part connected to the electromagnetic assembly. A blade mechanism is provided above the rotating support part. An annular first structural groove (28) is provided between the bottom of the rotating support part and the end face of the secondary flow cavity (12). The aforementioned floating seat (23) is arranged in the first structural groove (28).

3. An electronic water pump with a variable-angle impeller as described in claim 2, characterized in that: in A push seat (24) is fixedly connected to the inner ring of the auxiliary flow cavity (12) corresponding to the outer ring of the rotating support. An inner sliding gap is provided between the inner ring of the push seat (24) and the rotating support. An outer sliding gap is provided between the outer ring of the push seat (24) and the driven ring (19). A push ring (25) is also provided at the top of the outer ring of the push seat (24). A limiting ring (26) is fixed above the driven ring (19) by an array of floating seats (23). A wave spring (27) is provided between the limiting ring (26) and the push ring (25). The wave spring (27) slides in contact with the limiting ring (26) and the push ring (25). The height of the floating groove is greater than the height of the end of the guide blade (15).

4. An electronic water pump with a variable-angle impeller as described in claim 1, characterized in that: in A rotating groove is provided at the bottom of the secondary flow cavity (12), the driven ring (19) is slidably connected in the rotating groove, and the driving ring (17) is embedded in the bottom of the rotating groove.

5. An electronic water pump with a variable angle impeller as described in claim 1, characterized in that: in The inner ring of the driven ring (19) is provided with a second structural groove (29), and a first positioning ring (22) is provided at the bottom of the second structural groove (29). A support protrusion (21) extending toward the second structural groove (29) is provided in the inner ring of the secondary flow cavity (12). A second positioning ring that fits into the first positioning ring (22) is provided on the support protrusion (21). A number of inlaid protrusions are arranged in a ring array on both the first positioning ring (22) and the second positioning ring. The cross-section of the inlaid protrusions is triangular or arc-shaped.

6. An electronic water pump with a variable-angle impeller as described in claim 1, characterized in that: in The outer ring of the secondary flow cavity (12) is provided with several inlay seats (14), and there is a liquid inlet gap between the array axis of the inlay seats (14) and the outer ring boundary of the secondary flow cavity (12); an inlay groove is provided on the side of the inlay seat (14) facing the center of the secondary flow cavity (12), and the outer ring of the guide blade (15) is fixedly connected to the inlay groove.

7. An electronic water pump with a variable angle impeller as described in claim 1, characterized in that: Both ends of the guide blade (15) are provided with a bending part, which includes a stress relief part with an arc shape of greater than 180°.

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